Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. There are no cream or oil which can increase the size. To be noted size doesn t matter here as only 2.5 cm i.e, 1 inch is what is required to stimulate female sex organ. Its more on how you perform. Have a healthy meal, avoid using substance and improve your knowledge about enhancing your performance. Your penis size and circumference are good enough for a happy sexual life. Premature ejaculation is decided by partner orgasm. If its just 5 second than there are various way by which you can overcome premature ejaculation. Master and Johnson is one such technique in which 90% success rate is seen. Other being performing in certain sexual positions, various medication available which when taken before performing sexual activity will overcome premature ejaculation. You can try this at home- Read erotic material, or see erotic material in books/movies, to visualize it and note the sense of derived sexual pleasure with subsequent erection of penis. Start imagining yourself in the same situation. Start gently touching your penis or the testicles/groin region to enhance pleasure, but do not stroke the penis or indulge in masturbation. Later on you can even indulge in masturbation once you have mastered the earlier technique. While masturbation, when you have the feeling of imminent ejaculation, stop masturbation and squeeze head of the penis. See if it helps. Hope I have answered your query. Let me know if I can assist you further.